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Tax on Earnings (Detail 8) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Carryforward      
U.S. foreign tax credits $ 1,321us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign    
U.S. research and development and other credits 662us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch    
Tax credits in state and foreign jurisdictions 394hpq_DeferredTaxAssetsTaxCreditCarryforwardsStateAndForeign    
Deferred tax assets for various tax credit carryforwards 2,377us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 4,261us-gaap_DeferredTaxAssetsTaxCreditCarryforwards  
Valuation Allowance      
U.S. foreign tax credits 47hpq_TaxCreditCarryforwardForeignValuationAllowance    
Tax credits in state and foreign jurisdictions 204hpq_TaxCreditCarryforwardStateAndForeignValuationAllowance    
Balance at end of year 251us-gaap_TaxCreditCarryforwardValuationAllowance    
Valuation allowance balance      
Balance at beginning of year 11,390us-gaap_DeferredTaxAssetsValuationAllowance    
Income tax expense 1,544us-gaap_IncomeTaxExpenseBenefit 1,397us-gaap_IncomeTaxExpenseBenefit 717us-gaap_IncomeTaxExpenseBenefit
Balance at end of year 11,915us-gaap_DeferredTaxAssetsValuationAllowance 11,390us-gaap_DeferredTaxAssetsValuationAllowance  
Increase in valuation allowances 525us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 1,200us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Deferred tax asset valuation allowance      
Valuation allowance balance      
Balance at beginning of year 11,390us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
10,223us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
9,057us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Income tax expense 184us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
1,644us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
865us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Other comprehensive income, currency translation and charges to other accounts 341hpq_ValuationAllowancesAndReservesCurrencyTranslationAndOther
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
(477)hpq_ValuationAllowancesAndReservesCurrencyTranslationAndOther
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
301hpq_ValuationAllowancesAndReservesCurrencyTranslationAndOther
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Balance at end of year $ 11,915us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
$ 11,390us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
$ 10,223us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember